Added missing release notes for 3.17.1. (#8649)

CHANGES.txt

@@ -1,9 +1,11 @@
 2021-05-07 version 3.17.1 (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
   PHP
+  * Fixed PHP memory leaks and arginfo errors. (#8614)
   * Fixed JSON parser to allow multiple values from the same oneof as long as
     all but one are null.
 
   Ruby
+  * Fixed memory bug: properly root repeated/map field when assigning. (#8639)
   * Fixed JSON parser to allow multiple values from the same oneof as long as
     all but one are null.
 

php/ext/google/protobuf/package.xml

@@ -22,7 +22,9 @@
  </stability>
  <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
  <notes>
- No new changes in 3.17.0
+ * Fixed PHP memory leaks and arginfo errors. (#8614)
+ * Fixed JSON parser to allow multiple values from the same oneof as long as
+   all but one are null.
  </notes>
  <contents>
   <dir baseinstalldir="/" name="/">
@@ -975,6 +977,9 @@ G  A release.
    <time>16:06:12</time>
    <license uri="https://opensource.org/licenses/BSD-3-Clause">3-Clause BSD License</license>
    <notes>
+ * Fixed PHP memory leaks and arginfo errors. (#8614)
+ * Fixed JSON parser to allow multiple values from the same oneof as long as
+   all but one are null.
    </notes>
   </release>
  </changelog>